Improvement in watchmen s time detecters



J. E. BUERK.

WATCHMENS TIME DETECTOR.

115.181,519. Patented Aug.z9,1e7e.

jlfrwe 1% om N. PETERS. PHOTO-LITHOGRAPMER. wASHlNGTON, D C.

UNITED STATES PATENT OFFICE..

JAcOB E. BUEBK,IOE BOSTON, MASSACHUSETTS.

IMPROVEMENT zIN WATCHMENS TIME DETECTERS.

Specication forming part of Letters Patent No. 1S 1,519, dated August29, 1876; application filed July 22, 1ere.

To all whom it may concern Be it known that I, JACOB E. BUERK, ofBoston, in the county of Suffolk and State of Massachusetts, haveinvented a new and useful Improvement in Watchmens Time Detecters, whichimprovement is fully set forth in the following specilication, referencebeing had to the accompanying drawing, in which- Figure l represents ahorizontal section in v the plane :c w, Fig. 2. Fig. 2 is a verticalsec? tion in the plane y y, Fig. l. Fig. 3 is an inverted plan of themovement detached.

. Similar letters indicate corresponding parts. This invention relatesto certain improve ments in that class of watchmens time-detecters whichI have described in Letters Patent, No. 48,048, granted to me J une 6,1865. My present improvement consists in the combination, with thepartition-plate which separates the marking' devices in a watchmanstime-detecter from the clock-movement, and with the front and backplates, between which said clockmovement is situated, of aprotecting-case, which is rmly secured t0 the back plate, and one edgeof which bears against the inner surface of the front plate, while itsother edge bears aga-inst the partition-plate between the markingdevices and the clock-movement, so that by the combined action of saidcase with the .front and the partition plate the clock-movement iseffectually protected against impurities, which otherwise are liable tointerfere with the correct operation of the clock.

My improvement consists also in the com'- bination, with the soft-metalstud that cooperates with the guide -pin for the keys which operate themarking devices, of a steel face, so that the operation of manufacturingsaid stud, and of securing it in position, re-

mains the same as before, while the steel face,

prevents the keyswfrom wearing said stud, and thereby the correctoperation of themeehanism is insured.

In the drawing, the letter A designates the main case, which inclosesthe working parts' of my Watchmans time-detecter. The clockmovement B issituated between the front plate C and the back plate D, and with thesetwo plates is combined a partition-plate, E, which separates the markingdevices F from the clock-movement. With the front plate G, the backplate D, and the partition-plate E is combined a secondary case, G,which is firmly secured to the back plate, and the upper edge of whichbears tight against the in- I 'fectually protected againstthe entranceof impurities, such, for instance, as loose particles of tobacco, whichare usually found in the pockets of Watchmen, and which, when they findtheir way into the clock-movement, seriously interfere with the correctoperation ofthe detecter.

From the outside of the partition-plate projects a pin, a, which formsthe guide for the keys used for operating the marking devices F. Withthis pin is combined a stud, b, which is firmly secured to the innersurface of the front plate C in such a position that the bits of thekeys, on being turned, are closely conned between the shoulder of thepin a and the inner surface ofthe stud b, such being necessary in orderto cause the bit of each key to act on the particular marking de- Viceor devices for which the same is designed. rIhe stud b is made of brassor other soft metal, which can be easily worked; but I have found thatthe inner ends of the bits soon Wear out the brass face of the stud, andin a short time the keys have an end play on the pin a, whereby theircorrect action is interfered with. To obviate this difficulty I havecombined with the soft-1netal stud b a steel facing, c, whicheffectually prevents the bits of the keys from Wearing into the stud,while at the same time the labor ofmanufacturing said stud, and ofsecuring the same in its position, remains the same as before, and thecost ofthe stud is but slightly increased.

I disclaim in this present application everything shown and described inmy Patent, No. 48,048, referred to.

What I claim as new, and desire to vsecure by Letters Patent, is

l. The combination, in a watchmans time-v detecter, of the secondarycase G, front plate C, back plate'D, partition-plate E, marking deviceF, and clock-movement, constructed to operate substantially asdescribed, said sec plate, substantially as and for the purposespecified. 'Y

In testimony that I claim the 'foregoingl have hereunto set my hand andseal this 1st day of July, 1876.

JACOB E; BUERK.

Witnesses:

JOHN O.A BUERK, E. F. KASTENHUBER.

